Our real mother is of course Krishna and we must thank Him today.
“aham sarvasya prabhavo
mattah sarvam pravartate
iti matva bhajante mam
budha bhava-samanvitah” [Bg. 10.8]
Everything is produced from Krishna, Krishna is the source of everything and that is why He is the original mother. The Supreme Personality Of Godhead, even though everything emanates from Him, He also desires that He should also have a mother, so that He can enjoy the motherly love and affection.
Though Krishna is the original mother but He also likes to have a mother and that is why He has the original mother, Mother Yashoda. Both in the spiritual and the material world, He accepted Mother Yashoda and Mother Devaki as a mother, not only one mother because Krishna is very greedy for motherly love and affection.

In the Tenth Canto, Bhagavatam, Lord Krishna says that in this material world if we look for pure love, close to pure love (pure love cannot be found in the material world) then it can be found in a mother. That is the closest pure love, which we can find in the material world. A mother is so caring, protective and she serves the child so well, that makes a strong bond between the mother and the child. Just like if we come between a mother and the cubs, we are finished because the mother loves her offspring so much , this is the real bond or loving reciprocation between a child and the mother. A mother might be 10,000 miles away but a mother would be knowing what her child is going through.

Padavas, they were so grown up but when Mother Kunti would see them after a long time, immediately she would emanate parental love and affection. Same thing can be seen in Krishna’s past times, Krishna was so grown up and when He would see Mother Yashoda or Mother Yashoda would see Him, immediately parental love would be emanated. So this is a very affectionate, loving and intimate relationship between a child and the mother.
This is unparallel in the material world, we cannot compare the mother’s love towards the offspring to anything in the material world. Since she loves us so much, it is not enough to thank her only one day , we should thank her everyday and every moment.